Fine pitch gears and Small gearboxes



RoHS Compliance

Backlash – A “play” between gears
Backlash, sometime called “play” or “clearance” is necessary function for gearing. Though most machine designers think backlash is not desiable as it disturbs their ideal design. However in fact, proper backlash are necesasry to prevent damage due to lack of lublication. In addition, as every gear has deviations, noise and oscilation happen when gearing. Backlash is necessary to reduce noise and oscilation caused by gear deviations as backlash somewhat absorb such deviations. (PDF : “Backlash” from KG Technical Data)

On the other hand, demands for zero-backlash still exist. To meet such demands, we standardized Anti-backlash spur gears which can not remove backlash completely though, but can minimize backlash. Our Anti-backlash spur gears adopted time-honored method. Mechanism of Anti-backlash spur gear has built-in springs that pull each other between gear A and B to pinch the mating gear like a scissors. When rotated direction of the gear is reversible, the springs of Anti-backlash spur gear can continue to maintain suitable torque by pinching mating gear.If interference occurs due to gear quality, Anti-backlash spur gear with gear A and B absorbs the interference by stretching the spring mechanism while engaged between Anti-backlash spur gear and mating gear.

Anti-Bakclash Spur Gear Design – 3D CAD models and 2D CAD drawings
You are able to check dimensions of our standard Rack Gears through PDF catalog or Selector provided by Part Community. Free CAD data is available on the website. Click the below logo to access the Rack Gear Selector.

Quotation of Standard Anti-Backlash Spur Gears
Please request Quotation of Anti-Backlash Spur Gears through “Request For Quotation” page.

Anti-Backlash Spur Gear Modification
If you need to modify our standard Anti-Bakclash Spur Gears to suit your application, please consult with us. We are offering gear modification service. Please check the detail and example of modification at “Gear Modification” page.

Precaution of Usage
Please refer to the following precuation before using.
(PDF : “Precaution of usage for Anti-backlash spur gears” from KG Gear Catalog)

NSU type NS type NS type
NSU type NS type AlMg5 NS type C45
Material (ISO) : X5CrNi18-10
Module : 0.5
Number of teeth : 60 – 120
Material (ISO) : AlMg5
Module : 0.5 – 1.0
Number of teeth : 60 – 120
Material (ISO) : C45
Module : 0.5 – 1.0
Number of teeth : 60 – 120
Teflon coated to prevent scuffing and provide smooth motion.
Teflon coated to prevent scuffing and provide smooth motion.
Isonite treated to prevent scuffing and provide smooth motion.

NSG type ASG type  
NSG type ASG type
Material (ISO) : 34CrMo4 or 42CrMo4
Module : 0.5 – 1.0
Number of teeth : 60 – 120
Material (ISO) : 34CrMo4 or 42CrMo4
Module : 1.0 – 2.0
Number of teeth : 30 – 120
Precision ground tooth for more accurate positioning , less oscilation and low noise in high speed rotation.
Suitable for high torque and high speed application than spring type anti-backlash spur gears.

Mechanism of Anti Backlash Spur Gears

ASG type Method of ASG series is to loosen the bolts, then adjust gear A and B. This adjustment will allows to slip gear A and B into the match gear at a minimum backlash. This ASG series is only suitable for application that needs minimal backlash adjustment and the match gear needs to be high quality.
BS type Method of BS series is using a Circular Arc Spring to place between gear A and B in order to eliminate the backlash. BS series gears are allowable for low torque application.
BW type Method of BW series is the spring suspension of gear A and B.
The tension of spring will allow them to slip relatively to each other by the force.
This method will eliminate the backlash once gear A and B engage with the match gear.
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